Analysis

  • max time kernel
    149s
  • max time network
    153s
  • platform
    windows11-21h2_x64
  • resource
    win11-20260513-en
  • resource tags

    arch:x64arch:x86image:win11-20260513-enlocale:en-usos:windows11-21h2-x64systemwindows
  • submitted
    17/05/2026, 20:43

General

  • Target
    2026-05-17_6772c6281f504b807ccf483d4745918f_amadey_cobalt-strike_elex_hijackloader_icedid_luca-stealer_njrat_vidar.exe
  • Size 6.3MB
  • Sample260517-zh3z1acy21
  • SHA256 01ae29e1b1a8fb9369a4e1bfb71992372d6d5b861c54c3d990c05ee6862a6e10
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Signatures

  • Family: Fesber

    Fesber is a Windows worm written in Delphi.

  • Detects Fesber payload 9 IoCs
  • Modifies WinLogon for persistence 2 TTPs 1 IoCs
  • Drops file in System32 directory 3 IoCs
  • UPX packed file 1 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

  • Drops file in Program Files directory 64 IoCs
  • System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

Processes

  • C:\Users\Admin\AppData\Local\Temp\2026-05-17_6772c6281f504b807ccf483d4745918f_amadey_cobalt-strike_elex_hijackloader_icedid_luca-stealer_njrat_vidar.exe
    "C:\Users\Admin\AppData\Local\Temp\2026-05-17_6772c6281f504b807ccf483d4745918f_amadey_cobalt-strike_elex_hijackloader_icedid_luca-stealer_njrat_vidar.exe"
    1⤵
    • Modifies WinLogon for persistence
    • Drops file in System32 directory
    • Drops file in Program Files directory
    • System Location Discovery: System Language Discovery
    PID:5604

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

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        Downloads

        7z.exe

        • Path C:\Program Files\7-Zip\7z.exe
        • Size 6.9MB
        • SHA256 2dcc7c28844a198531ed144275006c9ac726fcab651070e7d2bd45cca74a0429
        • MD5 SHA1 SHA512 SSDEEP TLSH

        fsb.tmp

        • Path C:\Windows\SysWOW64\fsb.tmp
        • Size 6.3MB
        • SHA256 66b6c089d6cbfb10c6d90ba55bf1ca88b27026aecefe3829f9c2d0b889321fe4
        • MD5 SHA1 SHA512 SSDEEP TLSH

        memory/5604-1210-0x0000000000400000-0x000000000041B000-memory.dmp

        memory/5604-2208-0x0000000000400000-0x000000000041B000-memory.dmp

        memory/5604-2209-0x0000000000400000-0x000000000041B000-memory.dmp

        memory/5604-2210-0x0000000000400000-0x000000000041B000-memory.dmp

        memory/5604-2211-0x0000000000400000-0x000000000041B000-memory.dmp

        memory/5604-2215-0x0000000000400000-0x000000000041B000-memory.dmp

        memory/5604-2219-0x0000000000400000-0x000000000041B000-memory.dmp